Television – Bandwidth reduction system – Data rate reduction
Patent
1998-01-14
1999-03-23
Britton, Howard
Television
Bandwidth reduction system
Data rate reduction
348699, H04N 732
Patent
active
058867422
ABSTRACT:
In a video-coding and video-decoding device, motion-compensated interframe prediction is achieved by determining motion vectors of respective pixels according to representative motion vectors with weighting, and determining accurate motion vectors between video frames, dividing each frame into areas optimal to an objective figure, size and location and performing effective encoding and decoding of the motion vectors. According to the invention a motion-compensated interframe predicting portion generates a predicted video-frame by varying codable area according to a reference video-frame received from a frame memory portion and an input video frame and obtains side-information. A motion vector searching portion searches a motion vector. An effective-area selecting portion selects a valid or invalid mask depending upon a position of a processable object, divides a processable area of the input video frame into suitable areas, a variable-area predicted-frame generating portion generates a predicted frame by affine transformation and translational displacement. An area-diving pattern deciding portion outputs side-information such as the predicted image, motion vectors and divided areas, a side-information coding portion encodes an additional motion vector as a difference from an average basic-motion vector or predictively encodes a motion vector from a median value of three neighboring motion-vectors. A difference between the input video-frame and the predicted video-frame from the predicting portion is encoded, transferred and stored.
REFERENCES:
patent: 5006929 (1991-04-01), Barbero
patent: 5481310 (1996-01-01), Hibi
Ema Nobuyuki
Hibi Keiichi
Britton Howard
Sharp Kabushiki Kaisha
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